The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1998
Filed:
Mar. 26, 1996
Keiji Negi, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
A light modulation device includes a lithium niobate light modulator, an amplifier, and a bias control circuit. The lithium niobate light modulator modulates light from a light source in accordance with an input electrical signal, and outputs the modulated light. The lithium niobate light modulator includes a terminal for terminating the electrical signal. The amplifier amplifies the electrical signal to a level where it can drive the lithium niobate light modulator, and outputs the amplified signal to the lithium niobate light modulator. The amplifier includes an amplifying element at an output stage. A bias voltage of the amplifying element is set by externally supplied DC voltages. The bias control circuit supplies the DC voltages to the amplifying element, and a DC operating voltage to the terminating terminal of the lithium niobate light modulator to set a modulation operating point of the lithium niobate light modulator.